#includeThis code creates two vectors `u` and `v` and adds them together to get the vector `z`. The result is then printed to the console. Package library: The package library used in this example is `Vector3d.h`, which is likely a custom library created specifically for this project. However, there are many vector libraries that can be used with C++ such as the Eigen library or the Boost library.#include int main() { Vector3d u(1, 2, 3); Vector3d v(4, 5, 6); Vector3d z = u + v; std::cout << "z = (" << z.x() << ", " << z.y() << ", " << z.z() << ")" << std::endl; return 0; }